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Suppression of the jet quenching parameter near the critical temperature

Haibo Ren, Qianqian Du, and Yun Guo*

  • *Contact author: yunguo@mailbox.gxnu.edu.cn
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Phys. Rev. D 113, 054040 – Published 24 March, 2026

DOI: https://doi.org/10.1103/zyg7-k87r

Abstract

In this work, we study the jet quenching parameter q^ by using a background field effective theory. Particular attention is paid to its behavior near the critical temperature where nonperturbative effects induced by the deconfining phase transition are taken into account through a self-consistently introduced background field Q. We adopt a theoretical approach in which the interaction rate between the energetic jet and medium partons is computed diagrammatically and the hard-thermal-loop resummed propagator is used to regulate the infrared divergence. In the presence of a background field, its influence on the jet quenching parameter manifests in two aspects. One is the modification on the screening mass in the resummed propagator, which leads to an enhanced q^. The other corresponds to the Q-modified parton distribution function which is dominant and leads to a suppression of q^. Decreasing the temperature T, our result shows a nonmonotonic T dependence of the dimensionless q^/T3. In the high temperature region, q^/T3 shows an increase with decreasing T due to the running coupling effect. Near the critical temperature, the background field plays a significant role and a dramatic suppression of q^/T3 is found which qualitatively agrees with the lattice simulation. In addition, the background field modification on the jet quenching parameter which is characterized by the q^ ratio can be simply parametrized by a polynomial expression depending only on the background field. This expression is expected to be useful for phenomenological applications in jet physics.

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Phys. Rev. D 113, 054040– Published 24 March, 2026
  • Received 19 January 2026
  • Accepted 4 March 2026
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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